- Sub-class C0 or normal cervix incorporates all cases of normal cervical development.
- Sub-class C1 or septate cervix incorporates all cases of cervical absorption defects. It is characterized by the presence of a normal externally rounded cervix with the presence of a septum.
- Sub-class C2 or double cervix incorporates all cases of cervical fusion defects. It is characterized by the presence of two distinct externally rounded cervices; these two cervices could be either fully divided or partially fused. It could be combined with a complete bicorporeal uterus as a class U3b/C2 in the formerly Didelphys uterus.
- Sub-class C3 or unilateral cervical aplasia incorporates all cases of unilateral cervical formation. It is characterized by the unilateral, only, cervical development; the contralateral part could be either incompletely formed or absent. Obviously, this has happened in class U4 patients; however, this is not necessary to be mentioned in the final classification report (class U4 instead of class U4/C3) as being apparent. On the other hand, this sub-class gives the opportunity to classify other seldom anomalies such as complete bicorporeal uterus with unilateral cervical aplasia as class U3b/C3, which is a severe obstructing anomaly.
- Sub-class C4 or cervical aplasia incorporates all cases of complete cervical aplasia but also those of severe cervical formation defects. It is characterized either by the absolute absence of any cervical tissue or by the presence of severely defected cervical tissue such as cervical cord, cervical obstruction and cervical fragmentation. The decision to include all variants of cervical dysgenesis in sub-class C4 was made in order to avoid an extremely extensive sub-classification, which does not seem to be user friendly. This sub-class could be combined with a normal or a defected uterine body and gives the opportunity to classify all obstructing anomalies due to cervical defects.
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